It is narrated from Hazrat Abu Saeed (may Allah be pleased with him) that once I came to the Prophet (peace and blessings be upon him) and he was performing ablution with the water of Bir Buda’ah. I said, "O Messenger of Allah! So much filth is thrown into it, yet you are performing ablution with it?" The Prophet (peace and blessings be upon him) said, "Nothing can make water impure."